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Facile Synthesis of Aluminum‐Containing Mixed‐Metal Oxides Using Doped Carboxylate Alumoxane Nanoparticles
Author(s) -
Callender Rhonda L.,
Barron Andrew R.
Publication year - 2000
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2000.tb01464.x
Subject(s) - carboxylate , lanthanide , materials science , transmetalation , aluminate , yttrium , inorganic chemistry , thermal decomposition , chemistry , catalysis , oxide , metallurgy , stereochemistry , organic chemistry , ion , cement
A simple and rapid process has been developed that allows the formation of highly crystalline main‐group, lanthanide, and transition‐metal aluminates, including CaAl 12 O 19 (hibonite), Y 3 Al 5 O 12 (yttrium aluminum garnet, YAG), LaAl 11 O 18 , LaAlO 3 , Ce 2 Al 3 O 8 , NdAlO 3 , Er 6 Al 10 O 24 , and Al 2 TiO 5 . Carboxylate‐stabilized alumina nanoparticles (carboxylate alumoxanes) are reacted with the appropriate metal acetyl‐acetonate complexes to form metal‐doped carboxylate alumoxanes and aluminum acetylacetonate via a facile transmetalation reaction. Thermolysis of the metal‐doped carboxylate alumoxanes, up to a temperature of 1400°C, yields crystalline aluminates, as confirmed by X‐ray diffractometry, electron microprobe analysis, and scanning electron microscopy. The synthesis of different phases (i.e., LaAl 11 O 18 versus LaAlO 3 ) is controlled by the stoichiometry of the transmetalation reaction. A new, distorted, perovskite phase (with lattice parameters of a = 5.47 Å and c = 13.3 Å) of LaAlO 3 is formed. The alumoxane methodology results in multicomponent aluminate materials that are obtained in shorter processing times and with greater phase purity than previously reported. This observation is undoubtedly due to the atomic‐scale mixing that is inherent in the alumoxane nanoparticle approach.